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Terrible MK25 owner needs an answer

MK25s are only threaded to metric, unless they have replaced the barrel or it was the suppressor specific model, which would be annotated by the model type.
 
i agree with you all signs point to metric no suppressor sights siglite standard #8 i believe LH threads and tight thread grouping..im 95% sure metric but am i $90 piston and $200 tax stamp sure? lol
 
Metric threads shoulder on the muzzle. SAE on the barrel relief at the back of the threads. Google the thread pitch and there are pictures of metric and see next to eachother. If you can't figure it out after that you are beyond Internet help.
 
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